package at.fpmedv.eclipse.helma.launcher.actions;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.jface.dialogs.MessageDialog;

import at.fpmedv.eclipse.helma.core.HelmaCorePlugin;
import at.fpmedv.eclipse.helma.core.HelmaPluginRuntimeException;
import at.fpmedv.eclipse.helma.core.HelmaServer;

/**
 * Our sample action implements workbench action delegate.
 * The action proxy will be created by the workbench and
 * shown in the UI. When the user tries to use the action,
 * this delegate will be created and execution will be 
 * delegated to it.
 * @see IWorkbenchWindowActionDelegate
 */
public class HelmaLauncherAction implements IWorkbenchWindowActionDelegate {

	/**
	 * if this action has been activated
	 */
	private boolean activated = false;

	/**
	 * holds the core plugin
	 */
	private HelmaServer helmaServerPlugin = null;
	
	/**
	 * the window to operate on
	 */
	private IWorkbenchWindow window;
	
	/**
	 * The constructor.
	 */
	public HelmaLauncherAction() {
	}

	/**
	 * The action has been activated. The argument of the
	 * method represents the 'real' action sitting
	 * in the workbench UI.
	 * @see IWorkbenchWindowActionDelegate#run
	 */
	public void run(IAction action) {
		if (activated) {
			try {
				helmaServerPlugin.stopServer();
				helmaServerPlugin = null;
				activated = false;
				action.setText("Start Helma");
				action.setToolTipText("Start Helma");
			} catch (HelmaPluginRuntimeException e) {
				MessageDialog.openError(window.getShell(), "HelmaPlugin", "Error stopping helma: " + e.getMessage());
			}
		} else {
			try {
				if (helmaServerPlugin == null) {
					// create server lazy
					helmaServerPlugin = HelmaCorePlugin.getDefault().getServer();
				}
				helmaServerPlugin.startServer();
				activated = true;
				action.setText("Stop Helma");
				action.setToolTipText("Stop Helma");
			} catch (Exception e) {
				MessageDialog.openError(window.getShell(), "HelmaPlugin", "Error starting helma: " + e.getMessage());
			}
		}
		// MessageDialog.openInformation(window.getShell(), "Helma started", activated + "");
	}

	/**
	 * Selection in the workbench has been changed. We 
	 * can change the state of the 'real' action here
	 * if we want, but this can only happen after 
	 * the delegate has been created.
	 * @see IWorkbenchWindowActionDelegate#selectionChanged
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	/**
	 * We can use this method to dispose of any system
	 * resources we previously allocated.
	 * @see IWorkbenchWindowActionDelegate#dispose
	 */
	public void dispose() {
	}

	/**
	 * We will cache window object in order to
	 * be able to provide parent shell for the message dialog.
	 * @see IWorkbenchWindowActionDelegate#init
	 */
	public void init(IWorkbenchWindow window) {
		this.window = window;
	}
}